The Brooklyn Brewery is a great place to grab a beer. With a nice aftertaste because the Brooklyn Brewery supports many charities and its employees voluntarily help with various local initiatives. Sit at one of their long tables and have a beer and chat with some of the local people in this supercool neighbourhood.
You can also just take a look inside or join a brewery tour in the weekends. No need to book beforehand, just stop by and sign up. The brewery's opening hours vary by the day. Check Brooklyn Brewery for the schedule. You can find the Brooklyn Brewery at 79 North 11th Street in, how else, Brooklyn. Easy to get to. Just take the grey L and exit at Bedford Avenue.